Steam boiler



P. THOMSEN March 1 1927.

STEAM BQILER Filed June 15, 1923 3 Sheets-Sheet l/VVE/VTOR PE TEA THOMSEN WITNESS ATTORNEYS March 1927' P. THOMSEN STEAM BOILER Filed June 15, 1923 3 Sheets-Sheet 5 INVENTOR PE f/P THOMSE/V s ooooooooo ooo ooo A TTORNEYS Patented Mar. 1, 1927.

UNITED STATES PETER THOMSEN, F CASSEL-WILHELMSHOHE, GERMANY, ASSIGNOR TO SCHMIDTSCHE HEISSDAMPF-GESELLSCHAFT M. B. 1-1., OF CASSEL-WILHELMSHOHE, GERMANY, A

CORPORATION 01 GERMANY.

1,619,447 PATENT OFFICE.

STEAM BOILER.

Application filed June 15, 1923, Serial No. 645,531, and in Germany June 28, 1922.

ers are intended for high steam pressures.

In boilers of this type, particularly those in which the steam and water containers have. upright water tubes extending downwardly from them, the heat reaches most strongly those portions of the containers which have been weakened by their connection with said upright tubes. Various attempts have been made to remedy this defect but so far with poor success. My invent-ion secures efiiclent protection for such steam and water containers by means of a cooled protective wall of a peculiar novel construction.

Three examples of my present invention are illustrated by the accompanying drawings in which Fig. 1 is a vertical cross section of a locomotive boiler embodying my invention; Fig. 1 is a section taken longitudinally of the boiler; Fig. 2 is a vertical cross section of another form of the invention; Fig. 3 is a plan corresponding to Fig. 2 with parts in section; Fig. 4 is a partial elevation showing still another form of this invention and Fig. 5 is a corresponding plan with parts in section.

According to Fig. 1 the steam and water containers (1 of the boiler are connected by tubes i with water chambers 72. located at opposite sides of the grate g situated below the oiler. These water tubes 2' extend upward- 'in an approximately vertical direction f rom the said water chambers h and the upper portions of these tubes are bent inwardy and each of the sets of tubes 2' is, connected with the container act the o posite side; that is to say, the'tubes i of the eft-hand set are connected with the right-hand container and vice versa.

In order that the tubes 2' may properly cross each other adjacent tothe connection of the two containers a, I prefer to arrange those of one set out of line transversely with those of the other set; this staggered arrangement will be understood best by reference to Fig. 3. The upper portions of the tubes 2' which, as above mentioned, cross each other, form a protective wall and in order to make such wall continuous or imperforate, various expedients may be adopted. The spaces or slots between adjacent upper portions of the tubes 71 might be filled with refractory material as indicated by b at the right-hand side of Fig. 1. This figure also shows intermediate chambers is at the junction of the uprightportions of the tubes '5 with their inclined upper portions. The chambers h are provided with openings in line with the upright portions of the tubes 2', such openings being normally closed by screw plugs Z or the like. Upon removing the screw plugs the lower upright portions of the tubes i may be cleaned by means of a rod or other suitable tool introduced through said openings. Similar openings might be provided in the chambers k in line with the inclined upper portions of the tubes '5.

Instead of forming the rotective wall with the aid of a refractory lling such as b in Fig. 1, I may employ plates 0 of asbestos or other suitable material at the upper portions of the tubes i as shown in Fig. 2, thereby forming the desired imperforate wall. These plates need not extend upwardly beyond the crossing point of the two sets of tubes i.

In the third example of my invention, illustrated by Figs. 4 and 5. the continuous imperforate protective wall is formed by providing the tubes 2' with lateral flanges (1 extended into mutual contact from adjoining tubes i; these flanges might extend only along the upper portions of the tubes 2' but I have shown them as continued down to the water chambers h. It is not necessary to have these flanges extend up beyond the crossing point of the two sets of tubes and I have shown them as terminating at such point. Of course the flanges d of one set are properly recessed to fit the tubes 1' of the opposing set.

It will be understood that the intermediate chambers k of Fig. 1 might be used in connection with constructions such as illustrated b Figs. 25. .On the other hand, I might omit these intermediate chambers k from the construction illustrated by Fig. 1 in which case the pipes i of that construction would be of the same general arrangement as shown in Figs. 2 and 4.

In each of the three examples of my invention the iinperforate wall protecting the steam and water containers at against the injurious effects of excessive heating, consists of the upper portions of the water tubes 2', together with a barrier filling the spaces between adjacent tube portions, which barrier may be constructed in various ways, being constituted for instance by the refractory material I) of Fig. 1 or by the plates 0 of Figs. 2 and 3, or by the flanges d of Figs. 4 and 5.

Various changes in the specific form shown and described may be made within the scope of the claims without departing from the spirit of my invention.

I claim:

1. In a steam boiler, a furnace, water tubes 10 *ated at opposite sides of said furnace and extending upwardly therefrom, steam and water containing means connected with the upper ends of said tubes, the upper portions of the tubes on each side being bent towards the other side, and each tube crossing each 2. In a steam boiler, a. furnace, water tubes located at opposite sides of said furnace, and

extending upwardly therefrom, steam and water containlng means connected with the upper ends of said tubes, the upper portions of each tube on both sides being bent towards the opposite side and crossing each other, and a barrier filling the spaces between said upper tube portions, and forming in connection with said crossed upper portions a protective wall for said steam and water containing means. v

3. In a steam boiler, a furnace, water tubes having lower portions extending upwardly at the sides of said furnace, and upper portions extending inwardly toward each other, steam and water containing means connected with the upper ends of said upper portions, intermediate chambers located at the junction of such upper and lower portions to facilitate the cleaning of such tube portions, and a barrier filling the spaces between said tube portions and forming in connection with said upper tube portions a protective wall for such steam and water containing means.

In testimony whereof I have hereunto set my hand.

PETER THOMSEN. 

